Hollow tiling-block.



No. 742,709. PATBNTED OCT. 27, 1903.

K. M. MITCHELL & J. DELL.

HOLLOW TILING BLOCK. APPLIOATION'FILED AUG. a, 1903.

H0 KODEL.

Ilium 1955951 d%,/ M Zumutor! UNITED STATES Patented October 27, 1903.

- PATENT OFFICE.

KERR MURRAY MITCHELL, OF ST. JOSEPH, AND JOHN DELL, OF ST. LOUIS, MISSOURI.

HOLLOW TlLlNG-BLOCK.

' EPECIFICATION forming part of Letters Patent No. 742,709,

dated October 27, 1903.

Application filed August 8, 1903. Serial No- 168,825. (No model.)

To all whom it may concern:

Be it known that we, KERR IVIURRAY MITCH- ELL, residing at St. J oseph, county of Buchanan, and JOHN DELL,residing at St. Louis, State of Missouri, both citizens of the United States, have invented new and useful Improvements in Hollow Tiling-Blocks, of which the following is a specification.

Our invention tiling-blocks of special novel construction.

Although our blocks may be used in various branches of the arts, we illustrate them as more especially adapted for the abstraction and utilization of the waste heat of the outgoing gases and to aiford an effective heatabsorbing surface in gas-furnaces, &c.

Figure l is a plan of a single short one of our novel hollow blocks in one piece and having interior ribs projecting toward each other from two opposite walls; Fig. 2, a perspective of the same; Fig. 3, a similar plan, but with a recess at one end for a purpose presently to be explained; Fig. 4, a similar plan, but the block having three holes or hollow spaces or passages through it and with the recess at one end; Fig. 5, a series of the hollow tiles as when cemented end to end; Fig. 6, a perspective illustrating on a somewhat larger scale one of our tripassage blocks and indicating their position relatively to our smoke-flue tiles, for which we have applied for an independent patent in Serial No. 138,004, filed January 6, 1903, for recuperators of gas-furnaces.

Our tiles A, as shown, are made integral and hollow and while in some cases are preferably made each in three compartments or sections 1 2 3, (see Fig. 4,) yet the interior structure is the same in all. This interior novel structure is as follows: On the inside orhollow portion of these tiles are formed projecting ribs a, which are integral with both the opposite insides of the walls of the tiles, These ribs are inclined or narrowed from their bases to their edges or extremities so that near the center of the space within the tile their narrow edges may face each other and near to each other within the same chamber of the tile, the

tile being, as shown, closed at four sides and consists inimproved hollow open'at top and bottom. Each of these tiles has thus within its hollow space two rows of such projecting ribs, afiording ample means for absorbing heat from any sourceas, for instance, from the smoke-fines of a furnace, recuperator, gas furnace, gas retorts, and wherever it is desirous to abstract and utilize the otherwise waste heat of the outgoing In Fig. 3 we show a single tile A, having projections b at one of its ends extending somewhat beyond the length of the tile, leaving a recess 0 between such projections, which recess we fill with cement when we join each projecting end against the end of its neighbor tile.

In Fig. 4: we show a single tile embodying our hollow feature and our interior ribsin each of its three holes or spaces and having at one ofits ends projections b and recess 0, this tile, its projections, and recess being all integral.

In Fig. 5 we illustrate a top view showing a series of our blocks, shorter or longer, as the case may be, each and all embodying our structure as above set forth.

The air to be heated passes upward and impinges upon the many heated ribs or points of the hollow tiles, and these ribs materially strengthen these tiles and act as absorbers to gather heat from any smoke-fines and give it out again to the air on its way upward. By these means We get an effective heat-absorbing surface and recuperate or regenerate the heat and can use it more completely than by any means known to us.

What we claim is as follows:

1. Hollow tile, made in a single piece and having integral with it internal ribs projecting from its opposite side walls, the space between the ribs being continuous through the block and supplying large heat-radiating surface from such inside walls as set forth.

2. Hollow tiling having inside projections the space between them being continuous through the block as set forth for presenting large heating-surface to the air and for conducting the waste heat from the smoke-fines to the ingoing air for complete combustion of furnace gases, and having external projec- I names to this specification in the presence of tions at the end for joining tile against its adthe subscribing wltnesses.

jaeent tile and with fire cement filled between such projections.

3. Hollow tile, having three compartmentpassages through. it, and having inside of each passage and integral With its side Walls radial heating-ribs projecting centrally from such side Walls, and having at one end of the 10 tile an external recess for cement for the purpose as set forth.

In testimony whereof We have signed our KERR MURRAY MITCHELL. J NO. DELL.

Vitnesses as to the signature of Kerr Murray Mitchell:

HENRY B. LYSAGHT, WILL E. Woonson. lVitnesses as to the signature of John Dell:

EDW. H. FUNKE, W. N. THOMAS. 

